code: def test_checkout_commit(self):
      repo = Repo(git_repo_path)
      self.assertNotEqual(repo.head.commit.hexsha, GIT_TEST_SHA)
      with checkout_commit(repo, GIT_TEST_SHA):
          self.assertEqual(repo.head.commit.hexsha, GIT_TEST_SHA)
      self.assertNotEqual(repo.head.commit.hexsha, GIT_TEST_SHA)
  
file_path: H2O/h2o_flexgen/benchmark/third_party/transformers/tests/repo_utils/test_tests_fetcher.py
imports: import os
  import sys
  import unittest
  from git import Repo
  from tests_fetcher import checkout_commit, clean_code, get_module_dependencies
label_desc: Use image node_id 2 for calling the CheckDummiesTester obj's underlying member method code with example usage: obj.test_checkout_commit() without return types